Spinels and oxygen fugacity in olivine-phyric and lherzolitic shergottites

Estimates of Oxygen Fugacity in the Basaltic Shergottites from Electron Microprobe Oxygen Analysis

Rb-Sr AND Sm-Nd STUDIES OF OLIVINE-PHYRIC SHERGOTTITES RBT 04262 AND LAR 06319: ISOTOPIC EVIDENCE FOR RELATIONSHIP TO ENRICHED BASALTIC SHERGOTTITES

Introduction: RBT 04262 and LAR 06319 are two Martian meteorites recently discovered in Antarctica. Both contain abundant olivines, and were classified as olivinephyric shergottites [1]. A detailed petrographic study of RBT 04262 by [2] suggested it should be reclassified as a lherzolitic shergottite. However, the moderately LREE-depleted REE distribution pattern [3] indicated that it is closel...

Crystallization Experiments of Dar Al Gani Martian Meteoites: a Preliminary

Introduction: Recently, a lot of basaltic shergottites have been found from the desert areas in northern Africa and Middle East Asia. Most of them contain large olivine grains that are not present in the previously known basaltic shergottites (except for EETA79001). These olivine grains are mostly Mg-rich, but they show different mineralogical features in each meteorite. Dar al Gani 476 and its...

Comparison of Redox States between Geochemically-intermediate and Enriched Lherzolitic Shergottites

Introduction: Lherzolitic shergottites show similar mineralogy and ages [e.g., 1,2], and are widely believed to have originated from the geochemically-intermediate reservoir having distinct trace element and isotopic compositions [e.g., 3,4]. RBT04262 and NWA4468 are recently discovered new shergottites that contain py-roxene oikocrysts enclosing olivine and chromite, and petrographically simil...

Magnetism of Shergottites

Introduction: New discoveries in cold (Antarctica) and hot desert areas have significantly increased the number of Martian meteorites (SNC) to more than 50 (unpaired) [1,2]. Martian meteorites are classified in four main groups in terms of their pe-trology and mineralogy, namely Orthopyroxenite (1 published member), Chassignites (dunite, 2), Nakhlites (clinopyroxenite, 7) and Shergottites (42) ...